Not gonna lie, limiting to 7 is hard....top choices with trying to keep a range of animals
Including critters from New Zealand and Papua New Guinea as well:
Frilled neck lizard (Auz)
Punkrock turtle Murray River Turtle (Auz)
Tuatara (NZ)
Giant Weta (NZ), aka world's largest bug
Mount Kaputar pink slug (Auz)
Numbat (Auz)
Feather tailed possum (Papua New Guinea)
If I had to limit to only Oz:
Trade Tutara for stump-tailed skink
Weta for Priam's birdwing:
Feathertailed possum for Pygmy Possum